10MM Velocity Comparison-(3) Guns- 4 different barrel .

[475/480]

Compression is fairly heavy.

Sean

I will increase the loads a little this weekend,probably all powders except the AA9 loads.
Bullets - Sierra 165gr HP's.
STI 10 MM , 6"*****************************
Primer , WLP : OAL 1.260"
Powder:
AA9 -15.0gr = 1368
AA9 -15.5gr = 1378
AA9 -16.0gr = 1421

Glock G20SF - 4.6"**********************************

AA9 -15.0gr = 1235
AA9 -15.5gr = 1232
AA9 -16.0gr = 1250


Sean

Interesting dead zone with 15-15.5 grains of #9.  Then at 16.0gr it wakes up nicely.

Do you recall if those were beginning to be compressed yet?  If so, would you call the compression light, moderate, heavy, maxed out?  If powder can still fit, it might be interesting to see the results of 16.5gr.

[475/480]

I thought these were going to be Speer 165gr GS but NO, kinda suggests I have too many orders coming
I will increase the loads a little this weekend,probably all powders except the AA9 loads.
Bullets - Sierra 165gr HP's.
I shot these in my STI 10MM -6" bll and G20SF -4.6" bll
STI 10 MM , 6"*****************************
Primer , WLP : OAL 1.260"
Powder:
AA7-12.5gr =1351
AA7-13.0gr =1434
AA7-13.5gr =1463
AA7-14.0gr =1519 . I had some 14.5gr loaded but stopped at this point.
Blue Dot -12.0gr = 1346
Blue Dot -12.5gr = 1400
Blue Dot -13.0gr = 1466
Blue Dot -13.5gr = 1481
Blue Dot -14.0gr = 1541
800X -8.5gr = 1264
800X -9.0gr = 1342
800X -9.5gr = 1372
800X -10.0gr =1465
800X -10.3gr =1494
AA9 -15.0gr = 1368
AA9 -15.5gr = 1378
AA9 -16.0gr = 1421
LongShot -8.0gr = 1251
LongShot -9.0gr = 1386
LongShot -10.0gr = 1437
LongShot -10.5gr = 1476
LongShot -10.8gr = 1490
Glock G20SF - 4.6"**********************************
AA7 -12.5gr = 1255
AA7 -13.0gr = 1284
AA7 -13.5gr = 1324
AA7 -14.0gr = 1414
AA7 -14.5gr = 1432
Blue Dot -12.0gr = 1215
Blue Dot -12.5gr = 1288
Blue Dot -13.0gr = 1315
Blue Dot -13.5gr = 1364
Blue Dot -14.0gr = 1381
800X -8.5gr = 1160
800X -9.0gr = 1180
800X -9.5gr = 1290
800X -10.0gr=1343
800X -10.3gr =1369
AA9 -15.0gr = 1235
AA9 -15.5gr = 1232
AA9 -16.0gr = 1250
LongShot -8.0gr = 1163
LongShot -9.0gr = 1260
LongShot -10.0gr = 1309
LongShot -10.5gr =1351
LongShot -10.8gr = 1391

Sean

[REDLINE]

Compression is fairly heavy.

No doubt the shorter Gold Dot 165gr counterpart would help in continuing further with a heavier powder charge.

[REDLINE]

First, not only are the general workups awesome to see, but even more so from 2 different barrel lengths.  TYVM for sharing the data!

I was studying the numbers toward which powders work best for more velocity from a 6" barrel over a 4.6".  Following I've listed the additional velocity gained from the 6" for the loads listed.

AA7 12.5gr = 96 FPS
AA7 14.0gr = 105 FPS

BD 12.0gr = 131 FPS
BD 14.0gr = 160 FPS

800X 8.5gr = 104 FPS
800X 10.3gr = 125 FPS

AA9 15.0gr = 133 FPS
AA9 16.0gr = 171 FPS

LS 8.0gr = 88 FPS
LS 10.8gr = 99 FPS

I'll further be curious to see the same criteria for your next batch  The only other two powders I'ld like to see the same type workups on (in this specific 165gr bullet weight) are Ramshot Silhouette and VihtaVuori 3N38.  If I ever get to buy bullets again I may find out for myself.

[475/480]

I got to the range this weekend and shot some 200 gr GDHP's.I started fairly low and am working up .
Gun was the G20SF with 4.6" bll and a couple loads in the RIA 5" bll.
Speer 200 gr GDHP , Primer WLP, cases Starline. OAL 1.260"
Gun G20SF*******
Powder:
800X-
8.0gr =1067
8.5gr =1100
8.8gr
9.3gr
Blue Dot-
10.0gr =1047
10.5gr =1084
10.8gr
11.3gr
AA7 -
11.0gr =1120
11.5gr =1182
12.0gr =1227
LongShot -
7.5gr =1060
8.0gr =1113
8.5gr =1149
8.8gr
9.3gr
AA9-
12.5gr =1044
13.0gr =1083
13.5gr =1114
RIA -5" barrel******************
LongShot-
8.0gr =1151
AA9-
13.0gr =1156
13.5gr =1193
Next weekend I will shoot the other loads shown above.

Sean

[The_Shadow]

Thanks for the range report, seeing the AA numbers leads me to believe the other higher numbers will work as well if pressure signs were acceptable. 

[RMM]

I shot a few last weekend but it was almost dark and I was in a hurry so I didn't get to test all the loads I had worked up (I worked up lots of AA#9, 800x, and Longshot loads) and and saved most for another day (chrono started having problems due to lighting).

G20 - 4.6" Stock Bbl.
Primer: CCI-300
COAL: 1.255"

800x
9.0 - 1150
(have worked up to 9.4 but will shoot later)

Longshot
8.6 - 1115
(have worked up to 9.0 but will shoot later)

AA#9
12.5 - 1150
(have worked up to 13.0 but will shoot later, also 12.5 w/ CCI-350)

No flattened primers or pressure signs. 

I shot one into some 2-liter soda bottles out of the 6" which I'm guessing was 1200+ fps with the 12.5 AA#9 load... it was getting dark and I lost the bullet!  It went through three bottles and nicked and bounced off the fourth bottle, there were absolutely no fragments in the jugs so I know it held together but it it was dark and I was in a hurry and couldn't find it in the weeds.

[Rome]

11.3 Grains of blue dot in 200 Grain bullets using GDHP seems a little high I wonder what the pressure are? I like to try that to but I think I let you try it first you should hit 1300 fps  I dont think the bullet will stay together, Hell I give it a try too once I get set up.

[475/480]

I got to the range this weekend and shot some 200 gr GDHP's.I started fairly low and am working up .
Gun was the G20SF with 4.6" bll and a couple loads in the RIA 5" bll.
Speer 200 gr GDHP , Primer WLP, cases Starline. OAL 1.260"
Gun G20SF*******
Powder:
800X-
8.0gr =1067
8.5gr =1100
8.8gr =1130
9.3gr =1145
Blue Dot-
10.0gr =1047
10.5gr =1084
10.8gr =1093
11.3gr =1133
AA7 -
11.0gr =1120
11.5gr =1182
11.8gr =1201
12.0gr =1227
12.3gr =1271
LongShot -
7.5gr =1060
8.0gr =1104
8.5gr =1118
8.8gr =1128
9.3gr =1177
AA9-
12.5gr =1044
13.0gr =1083
13.5gr =1114
RIA -5" barrel******************
800X -
8.8gr =1217
9.3gr =1274
Blue Dot -
10.8gr =1168
11.3gr =1222
LongShot-
8.0gr =1151
AA9-
13.0gr =1156
13.5gr =1193
13.8gr =1216
I will try and get some loads shot into wetpack next weekend but it could take 2 weekends to get it done.
Sean

[The_Shadow]

Sean, Thanks for the range report, very interesting numbers.    
Did you get a chance to look over the brass casings?

[475/480]

  No I didn't . I keep forgetting to do that . I will try this weekend to run some thru the Kimber Target II and take measurements.

Sean

Sean, Thanks for the range report, very interesting numbers.    
Did you get a chance to look over the brass casings?

[cphills]

Hey Guys,
A general question.... Is there concern or special precautions loading plated bullets for G20? Issues leading the polygonal barrel?

Thanks!
CPHills

[475/480]

Keep the velocity on plated bullets at 1300 fps or less.
Glocks have some issues with lead bullets , I just make sure to clean the barrel after every shooting session when shooting lead in my G20 SF.

Sean

Hey Guys,
A general question.... Is there concern or special precautions loading plated bullets for G20? Issues leading the polygonal barrel?

Thanks!
CPHills

[The_Shadow]

Hey Guys,
A general question.... Is there concern or special precautions loading plated bullets for G20? Issues leading the polygonal barrel?

Thanks!
CPHills

The things to be concerned with the plated bullets is some have very thin plating, if damaged it can be spun of with bullet rotation.  Things that can damage the plating are being nicked or shaved during the loading process.  By that I mean the cases have to have enough case mouth flaring, to let the bullet slide inside and not scrape off or snag the plating.  With all the semiauto cartridges it is best to fully seat your bullets without any crimp being applied while the bullet is seated...with the bullet moving downward and if the case wall is being squeezed against that moving bullet it can cause issues like damage to the bullet plating or in with cast bullets, sometimes bullet materials can even roll up inside the case or on the edge of the case mouth to cause headspacing issues.  Also, as the casing snags the bullet, it can cause the casing to buckle slightly making for a loose bullet tension.

Now all that being said, properly loaded rounds keeping velocities at reasonable levels for the quality plated bullets are very useable from any rifling, including the Glock's poly rifling. 

[nickE10mm]

Yep, and I've pushed 180gr Berry's and Rainier's up to 1250+ fps and kept accuracy .... its all about a light crimp....